/ Dictionary / Index I irregular variable: Meaning and Definition of Find definitions for: irreg'ular var'iable Pronunciation: [key] — Astron. Astron. a variable star whose brightness variation is irregular. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. irregularity irrelative Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language